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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross $ 6,451   $ 5,716      
ACL (116) $ (111) (109) $ (119) $ (111) $ (109)
Premiums receivable and agents' balances, net of ACL 6,335   5,607      
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business")            
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross 6,025   5,303      
ACL (95) (91) (89) (94) (86) (85)
Receivables for Loss Sensitive Business            
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross 426   413      
ACL (21) $ (20) (20) $ (25) $ (25) $ (24)
Receivables for Loss Sensitive Business | Standard & Poor's, AA Rating            
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross 91   94      
Receivables for Loss Sensitive Business | Standard & Poor's, A Rating [Member]            
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross 59   54      
Receivables for Loss Sensitive Business | Standard & Poor's, BBB Rating            
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross 140   136      
Receivables for Loss Sensitive Business | Standard & Poor's, BB Rating            
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross 91   84      
Receivables for Loss Sensitive Business | Standard & Poor's, Below BB Rating            
Financing Receivable, Credit Quality Indicator [Line Items]            
Premiums Receivable, Gross $ 45   $ 45